Based on James Herriots beloved collection of stories, each season will consist of six episodes plus Christmas specials.
Season 5 will see the return of Callum Woodhouse as Tristan Farnon.
James Anthony-Rose also reappears as Richard Carmody.
All Creatures Great and SmallChannel 5
Also returning is Patricia Hodge as the wonderfully sophisticated Mrs Pumphrey, and her adored pampered Pekingese Tricki.
Filming will take place on location in Yorkshire for both seasons 5 and 6.
